Inner pipe support arrangement for double-walled drill pipe

Details Inner pipe support arrangement for double-walled drill pipe Inner pipe support arrangement for double-walled drill pipe

1981-02-25

1983-05-31

Novosad, Stephen J.

Boring or penetrating the earth

With above-ground means to impact an earth-penetrating means

175215, 138113, 285138, E21B 1718

Patent

active

043856683

ABSTRACT:
A double-walled drill pipe, having a plurality of outer pipe lengths connected end-to-end and a plurality of inner pipe lengths connected end-to-end and concentrically disposed within the outer pipes and defining an annular fluid flow passageway and a return flow passageway, is provided with an inner pipe support arrangement for minimizing stresses applied to the inner pipe lengths when blows are applied to the outer pipe lengths to drive a cutting bit. Each outer pipe length is provided with a ledge on its inner surface to provide a seat for an abutment on the outer surface of its adjacent inner pipe. When a blow is applied to the outer pipe lengths, the outer pipe is forced downwardly but due to inertial effects, the inner pipe unseats and is permitted to fall under its own weight. A resilient shock ring may be positioned on the length to cushion the fall of the inner pipe and provision may be made to limit axial displacement between the inner and outer pipes.

REFERENCES:
patent: 3473618 (1969-10-01), Becker
patent: 4313627 (1982-02-01), de Lange

Affiliated with

Also associated with

Rating

Inner pipe support arrangement for double-walled drill pipe does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Inner pipe support arrangement for double-walled drill pipe, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Inner pipe support arrangement for double-walled drill pipe will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2243005